Will AMD Radeon HD 6450 work on my PC?  

Tekno Venus said:

I can't understand what u replied Sorry for my English understanding can you explain somehow that i could understand it?

Apologies for confusing you. I'll try again :)

Sometimes motherboard give out certain patterns of beeps when the computer has an issue. It might go for example 1 beep, pause, 2 beeps, pause, 1 beep. Let it finish beeping unless it is one constant beep. If it gives out a detectable sequence, report it back.

If no beep pattern is recognisable, remove the card and install the old one back in. Can you boot again. If you can, put the new one in and try again. It might work. If not, can you boot into the BIOS? This is usually done by pressing Delete, F2 or F1 when the computer first starts, before going into windows. If yes, report back.

Hope this is clearer.
Stephen

Well as Stormy13 said that it won't run on that PSU, so it would be a unnecessary to check if i can boot into BIOS. So i will buy that case and PSU. And if i understood what stormy linked me the compare site, HD3850 is better for gaming than 6450?

Petey7 said:

As Tekno Venus said, try booting without the new card. If the computer boots with the old hardware configuration, chances are the graphics card can't run with the current power supply. I would go aheard and get the 600 watt PSU you linked to if I were you. If it can fit in the old case, I wouldn't worry about getting a new one too much. I definitely don't see how a new motherboard would help, but I might be missing something.

Thanks for agreeing with me, that i should buy new PSU what i linked before. And i will buy a new case, because i had to twist the case from behind so the HD3850 could fit in DDDDD ( didin't break anything important ).

Ok, this is getting slightly mad.

My final verdict, you need to upgrade the power supply and the one you linked earlier will be OK I think.